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公开(公告)号：US20180172755A1
公开(公告)日：2018-06-21
申请号：US15382014
申请日：2016-12-16
CPC分类号： G01R31/2825 , G01R31/027 , G01R31/2632 , H04N7/186
摘要： A test tool for a low voltage devices is described. The test tool comprises a voltage sensor, a current sensor, a diode sensor, a testing module, and an indicator. The voltage sensor determines a voltage between a first and second electrical wire from an alternating current (AC) transformer. The current sensor determines a current between the first and second electrical wires. The diode sensor determines a presence of a diode connected to the first and second electrical wires based on the current and the voltage. The testing module identifies one or more installation diagnostics related to a device to be coupled with the AC transformer. The indicator generates a visual or audible indicator corresponding to the one or more installation diagnostics.
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公开(公告)号：US20180156858A1
公开(公告)日：2018-06-07
申请号：US15831676
申请日：2017-12-05
发明人： ROBERTO BIANCHI
IPC分类号： G01R31/08 , G01R31/327
CPC分类号： G01R31/088 , G01R31/027 , G01R31/086 , G01R31/3274 , G01R31/3275 , H02J11/00 , H02J13/0013 , Y02B90/2607 , Y04S40/12
摘要： An operating component has a sensor device for recording measurement values and a communication device for transmitting a status report. A data storage device stores the recorded measurement values and a status estimation device determines an operating status with the aid of the recorded measurement values.
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公开(公告)号：US09891260B2
公开(公告)日：2018-02-13
申请号：US14726056
申请日：2015-05-29
发明人： Satsuo Kiyono , Eiji Ohno , Masahiro Uemura
CPC分类号： G01R31/04 , G01K3/04 , G01R31/027
摘要： The service life of electrical equipment is predicted using a thermal history sensor mounted in the electrical equipment. At least one thermal history sensor is mounted inside or on an outer wall surface of electrical equipment. The thermal history sensor includes dissimilar metal joints, and the resistance values of the dissimilar metal joints change in response to the amount of intermetallic compound growing in the dissimilar metal joints due to the temperature inside the electrical equipment or of the outer wall thereof during operation. A determining mechanism periodically or irregularly monitors and stores in memory the resistance values of the dissimilar metal joints from the thermal history sensor, and uses the stored history of resistance values to predict the service life of the electrical equipment.
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公开(公告)号：US09874613B2
公开(公告)日：2018-01-23
申请号：US15457491
申请日：2017-03-13
IPC分类号： G01R31/02 , G01R31/40 , G01R31/327
CPC分类号： G01R31/40 , G01R27/2694 , G01R31/025 , G01R31/027 , G01R31/14 , G01R31/3272 , G01R31/3274 , H02J3/00 , H02J2003/007 , Y02E60/76 , Y04S40/22
摘要： Test measurements on a utility power device by a switch matrix apparatus and a common voltage source as separate devices is performed. Through the switch matrix apparatus, the common voltage source selectively sends a first high voltage signal via a first lead to a first terminal of the utility power device, measures a first corresponding signal returned via a second lead of the switch matrix apparatus from a second terminal of the utility power device. While the first lead and the second lead of the switch matrix apparatus remain electrically coupled to the first and the second terminal of the utility power device, a second high voltage signal is selectively sent via the second lead to the second terminal of the utility power device, and a second corresponding signal returned from the first terminal of the utility power device via the first lead of the switch matrix apparatus is measured.
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公开(公告)号：US09851415B2
公开(公告)日：2017-12-26
申请号：US14609632
申请日：2015-01-30
申请人： North China Electric Power University , STATE GRID CORPORATION OF CHINA (SGCC) , State Grid Shanxi Changzhi Power Supply Company
发明人： Lei Dong , Ye Li , Aizhong Tian , Xiaoli Shen , Peng Liu , Chanqiong Wang
CPC分类号： G01R31/40 , G01R31/021 , G01R31/025 , G01R31/027 , G06F17/5009 , G06F17/5036 , G06F2217/78 , Y02E60/76 , Y04S40/22
摘要： The disclosure relates to the crossing field between a power transmission of an ultra-high-voltage and a power system simulation, specifically a method for analyzing an operation state of a substation by combining a whole grid model with a local grid model is provided according to the disclosure. The method includes following steps: performing a load flow calculation for the provincial grid to which a ultra-high-voltage line belongs, wherein initial data of the load flow calculation employs a grid model with E format for national power grid dispatching control center; making an equivalent transform for the model, forming an island independently from the provincial grid to which a ultra-high-voltage line belongs, and making a load flow calculation for the island to acquire data of node voltages and line transmission power.
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公开(公告)号：US09835671B2
公开(公告)日：2017-12-05
申请号：US14570103
申请日：2014-12-15
发明人： Seong Min Kim , Dae Woong Han , Jeong Won Roh
CPC分类号： G01R31/027 , G01D3/08 , G01D5/2073 , G01R31/025
摘要： According to the present disclosure, there are provided a method of determining which one of first and second input signals Rez+ and Rez− is shorted to ground based on a magnitude of a Lissajous signal, a method of determining which one of first and third output signals S1 and S3 is shorted to any one of the first and second input signals Rez+ and Rez− based on an average magnitude value of the third output signal S3, and a method of determining which one of second and fourth output signals S2 and S4 is shorted to the first input signal Rez+ based on an average magnitude value of the fourth output signal S4.
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公开(公告)号：US20170322242A1
公开(公告)日：2017-11-09
申请号：US15394920
申请日：2016-12-30
申请人： LSIS CO., LTD.
发明人： Seung-Wook LEE
IPC分类号： G01R21/133
CPC分类号： H02J3/36 , G01R31/027 , Y02E60/60
摘要： The present disclosure relates to an apparatus for predicting power loss of a transformer, and more particularly, to an apparatus for predicting power loss of a transformer, which is capable of predicting power loss by comparing temperature data of the transformer with reference data thereof. An apparatus for predicting power loss of a transformer according to one embodiment of the present disclosure includes a measurement unit configured to measure a temperature of a transformer, a calculation unit configured to calculate temperature data of the transformer on the basis of the measured temperature, a storage unit configured to set and store the reference data of the transformer, and a determination unit configured to determine power loss of the transformer by comparing the temperature data with the reference data, wherein the reference data includes power loss according to the temperature data.
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公开(公告)号：US20170227591A1
公开(公告)日：2017-08-10
申请号：US15040549
申请日：2016-02-10
CPC分类号： G01R31/025 , G01R31/027 , G01R31/06 , H02H3/165 , H02H7/042 , H02H7/045
摘要： Embodiments of the disclosure relate to detecting turn-to-turn faults in one or more windings of various objects. In one implementation, a fault detector receives a set of current measurements associated with a transformer and uses these measurements to execute a procedure for detecting a turn-to-turn fault in the transformer. The procedure can include dividing a steady-state differential current value by a steady-state voltage value to obtain one or more compensating factors, determining a magnetizing current amplitude indicator by multiplying the steady-state voltage value by the one or more compensating factors, determining a compensated differential current value by combining the steady-state differential current value with a modifier value that incorporates the magnetizing current amplitude indicator, comparing the compensated differential current value against a threshold value, and declaring an occurrence of the turn-to-turn fault in the transformer when the compensated differential current value exceeds the threshold value.
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公开(公告)号：US20170168034A1
公开(公告)日：2017-06-15
申请号：US15371085
申请日：2016-12-06
申请人： Roger Alan FENTON
发明人： Roger Alan FENTON
CPC分类号： G01N33/0036 , G01K13/02 , G01L7/00 , G01N33/26 , G01R31/027 , G01R31/44
摘要： An apparatus senses properties of a fluid. The apparatus has a pipe section, a valve, and an instrument. The pipe section has an envelope, through which a flow of the fluid is coupled between a tank of an electrical power device and a cooling device. The envelope is disposed about a longitudinal axis, and has a penetration disposed laterally, relative to the longitudinal axis. The valve is disposed within the one or more penetrations and has a closed position and an open position. The instrument is operable for the sensing of the fluid properties, and has a probe disposed in contact with the fluid through the valve in the open position.
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公开(公告)号：US09658273B2
公开(公告)日：2017-05-23
申请号：US14434299
申请日：2013-10-02
申请人： HYOSUNG CORPORATION
发明人： Kyung Rok Hwang , Jae Ryong Jung , Young Min Kim
CPC分类号： G01R31/1254 , G01R31/027 , G01R31/1227 , G01R31/1236 , G01R31/1272
摘要： Provided is a method of accurately detecting the location of a partial discharge in a power device. For this purpose, the present invention measures sequential positions of arrival of partial discharge signals and the differences in the time of arrival between the partial discharge signals with respect to a plurality of partial discharge sensors installed on the outside surface of a power device, divides the power device into a plurality of spatial sections, determines a spatial section where the location of a partial discharge is present using the sequential positions of arrival of the partial discharge signals, calculates the representative location value of the determined spatial section, and determines compensation values for the differences in the time of arrival to be applied with respect to the respective spatial sections.
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